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1 i DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Apr. 11, 1968, 849 0.G. 1221. Iden tiflcation is by serial number of the application and the heading indicates the number of pages of specification, including claims, and of sheets of drawing contained in the application as originally filed. The file of this application is available to the public for inspection; reproduction may be purchased for 30 cents per sheet.

Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED APRIL 29, 1969 749,337 DEFECT DETECTOR HAVING ROTATING PRISM SCANNER HAVING PLURALITY 0F PAIRS 0F PHOTOCELLS WITH COLORING AND SPACE FILTERING Gerald Irving Buckson, Newark, Del., assignor to Troxel Manufacturing Company, Moscow, Tenn., 2 corporation of Ohio Filed Aug. 1, 1968. Published Apr. 29, 1969 Int. Cl. G011: 21/30; H01j 5/16 US. Cl. 250-219 3 Sheets Drawing. 17 Pages Specification n l an An apparatus for detecting oif-color and gray spot defects on the peripheral face surface of a rotating cylindrical yarn package wherein diffuse white light is projected onto a narrow strip, parallel to the package axis, on the surface. The illuminated portion of the surface is viewed and the illumination therefrom is directed to two arrays of photodetectors which view the directed light spectrum through complementary space and color filtering means and emit electrical signals proportional to the energy received from the filtered directed light. Electronic circuitry is provided to subtract, amplify and discriminate signals from the complementary arrays of photodetectors in order to detect and record defects on the package surface exceeding a predetermined level. Means are also provided to segregate unacceptable packages.

April 29, 1969 G 1. BUCKSON DEFECT DETECTOR HAVING ROTATING PRISM SCANNER HAVING PLURALITY 0F PAIRS OF PHOTOCELLS WITH' COLORING AND SPACE FILTERING Filed Aug. 1, 1968 Sheet DEF. PUB.

SN-7M9337 INVENTCJI-i GERALD IRVING BUCKSON BY W pa/wzyv,

ATTORNEY p 29, 1969 BUCKSON DEF. PUB.

DE T DETECTOR VlNG ROTATING PRISM SCANNER AVING PLU ITY OF PAIRS OF PHOTOCELLS WITH CO ING AND SPACE FILTERING Filed Aug. 1, 1968 Sheet ,3 Of 3 Fl 6- Z A BLUE Y RED '/--|DEAL WHITE SURFACE \/YARN PACKAGE wnn YELLOW SPOT 5 -cRAY SURFACE WAVELENGTH Y' 9 FIG-'6 182 aa if Q R W I PATH 0F CENTERUNE 0F MENTOR SL|T94"(F|G.6)

/ GERALD mvmceucnsou ATTORNEY Apnl 29, 1969 G. BUCKSON DEF. PUB.

DEFECT DETECTOR HAVING ROTATING PRISM SCANNER HAVING PLURALITY OF PAIRS OF PHOTOCELLS SN-7Ll9337 WITH COLORING AND SPACE FILTERING Filed Aug. 1, 1968 Sheet 5 or 3 an o N 9 5: E 8 Eu 2 1 25 o g 5 N 2 =2 E w D N m 4 k 3 a m T 1r T Q 5 a a E E E c:

a E E a 2 g 5 2 m g 5 g g E s x g INVENTOR g 55 E f GERALD IRVING BUCKSON l I I b l g; I"; ATTORNEY 

